easypoi添加下拉预选值

// poi导出，生成Workbook

Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("生活老师导入","Sheet0", ExcelType.XSSF), ExportDormDTO.class, list);

// 设置下拉预选值

String[] dropDownValue = new String[]{"A", "B", "C", "D"};

String  dropDownSheetName= "生活评价";

XSSFDataValidationHelper dropDownValidationHelper = createXSSFDataValidationHelper(workbook, dropDownSheetName, dropDownValue);

DataValidationConstraint dropDOwnValidationConstraint = dropDownValidationHelper.createFormulaListConstraint(dropDownSheetName + "!$A$1:$A$" + dropDownValue.length);

Sheet firstSheet = workbook.getSheet("Sheet0");

CellRangeAddressList drowDownValueCoveringRowsAndCloumns = new CellRangeAddressList(2, firstSheet.getLastRowNum(), 5, 9);

XSSFDataValidation dropDownValidation =(XSSFDataValidation)dropDownValidationHelper.createValidation(dropDOwnValidationConstraint, drowDownValueCoveringRowsAndCloumns);

firstSheet.addValidationData(dropDownValidation);

downLoadExcel("生活老师评价导入.xlsx", response, workbook);

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下面是固定写法，是上面代码中使用到的局部方法

// 流导出

private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {

    response.reset();

    response.setContentType("application/x-download");

    response.setHeader("Content-Disposition",

            "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO-8859-1"));

    workbook.write(response.getOutputStream());

}

// 生成预选值的sheet页

private static XSSFDataValidationHelper createXSSFDataValidationHelper(Workbook workbook, String name, String[] strList) {

    Sheet sheet = workbook.createSheet(name);

    // 循环往该sheet中设置添加下拉列表的值

    for (int i = 0; i < strList.length; i++) {

        Row row = sheet.createRow(i);

        Cell cell = row.createCell((int) 0);

        cell.setCellValue(strList[i]);

    }

    workbook.setSheetHidden(workbook.getSheetIndex(name), true);

    XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper((XSSFSheet) workbook.getSheet(name));

    dvHelper.createFormulaListConstraint(name + "!$A$1:$A$" + strList.length);

    return dvHelper;

}

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